Meter and magnet core



Dec. 31, 1929;

J. ZUGER METER AND MAGNET CORE Filed May l9, 1928 IN V EN TOR.

Patented Dec. 31, 1929 UNITED STATES .ruLIUs zt'renn, F zoo,

- s'rocx COMPANY SWITZERLAND, ASSIGNOR T0 LANDIS 8c GYR, A.-G., A JOINT- OF SWITZERLAND METER AND MAGNET CORE Application filed May 19, 1928, Serial No The invention relates to a new and useful improvement in the drivmg systems of electricity meters, and more especially to novel and useful improvements in the cores of the driving electro-magnets in such meters.

Objects and advantages of the invention will be set forth in part hereinafter, and in part will be obvious herefrom, or may be learned by practicing the invention, the same being realized and attained through the instrumentalities and combinations pointed out in the appended claims.

The cores of the driving electro-magnets of electricity meters as almost universally constructed, consist of a plurality of thin plates placed together to constitute the core, al

though cores of solid cast metal have been employed to some extent. So-called dynamo sheets or plates are usually employed in fabricating cores, and in order to minimize the energy consumption, it is customary to inter-pose layers or strips of paper between the iron plates in building the core. On the opposite side of the plates from the paper there is mostly a thin layer of scale. The interposed paper laminae and the layers of scale both contribute to reduce the eddy cur rents.

The results so realized are in certain respects desirable and advantageous, but the construction and constituents described have certain disadvantages in many cases. For example, when a magnet core has lateral extensions at one or more places, the magnetic flux must pass transversely through the different lamellae or layers, and consequently the magnetic reluctance is very high. Furthermore, the alloy sheet-iron or coated plates have magnetizing curves which are very undesirable in connection with the curve load of a meter.

The present invention obviates the stated disadvantages and aberrant conditions and factors, by providing a core ofentirely different construction and having superior-characteristics under operating conditions. According to the broader features of my invention, I provide a core of non-laminar form and likewise avoiding certain disadvantages of the solid core, and wherein the parts or 279,164, and in Switzerland May 19, 1927.

particles of the magnetically conducting metal of the core are relatively minutely discontinuous both in the direction of flux and transversely thereto. Preferably also no layers, or other particular form or appreciable quantity, of magnetically non-conducting material is employed.

The preferred embodiment of my improved magnetic core, consists of, or largely comprises, pulverulent iron. When it is employed as the sole or main efi'ecti-ve constituent, the core may be made by pressing the pulverulent iron, intermixed with any suitable binder, or cohering agent, in a mold of the desired core form; although the cores may be otherwise constructed 'or produced.

' So far as concerns the main aspects of the present invention, the embodiments thereof in actual meter construction may be widely varied, and it is applicable to all the different forms of induction meters. In the accompanying drawing, the essential parts of thedriving system, and the armature element for one type of induction meter are shown. In the drawing, the meter disc 1 is mounted on a spindle 2, which is journaled driving worm 5 for the registering mechanlsm is fixed on the meter shaft, and a suitable brake magnet 6 is provided, all of which may be of usual form. The pressure magnet 7 has a core 8, and the current magnet 9 has a core 10, all of which are suitably supported within the meter casing 11 in any desired way. In accordance with the feature of the invention whereby preferably only one of the cores is of pulverulent magnetic material, the current core 10 may be of such a construction, and the pressure core 8 may be laminated or otherwise constructed as found most eflicient and desirable.

The pulverulent iron in suitable form and load curve, which by reason of the unavoidable friction of the meter mechanism has a falling value at lower loads. It is not necessary, therefore, with my invention, to pro- 5 vide a friction compensation, or a lead in the voltage circuit by unsymmetrical arrangement, to the same extent as heretofore. The pulverulent iron has the additional advantage that its energy consumption or watt loss is-relatively small. I

The driving system in induction meters usually comprises two electromagnets, although in certain cases only one, and in other cases more than two, are employed. Inem- 1 5 bodying and practicing my invention, it is usually preferable and advantageous, when a plurality of cores are employed, to make one of them, usually the current core, of pu1 verulent iron.

. The invention in its broader aspects is not limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its chief advantages. 7 What I claim is J 1. In an induction meter a driving mag- ,net core comprising a magnetically conduct-.

1 ing material minutely discontinuous but closely contiguous in the direction of-magnetic flux.

2. In an induction meter a driving magnet core comprising pulverulent iron and a cohering agent.

3. An induction meter including in combination a meter disc and shaft, driving mechanism therefor includin a coil, and a core comprising a magnetica ly conducting '40 material which is minutelydiscontinuous but closely contiguous in the direction of magnetic flux.

4:. An induction meter including in combination a meter disc and shaft, driving mechanism therefor including a coil, and a core consisting largely of pulverulent iron.

5. An induction meter including in combination a meter disc and shaft, driving mechanism therefor including a pressure coil and core and a current coil and core, one of said cores only consisting largely of pulverulent iron.

6. An induction meter including in combination a meter disc and shaft, driving mechanism therefor including a pressure coil and coreand a current coil and core, said current core only consisting largely of pulverulent iron. f k In testimony whereof, I have signed my dame to this specification.

JULIUS ZUGER. 

